Sealing material sheet for solar-cell module and solar-cell module using the same

A sealing material sheet for a solar-cell module,

• the sealing material sheet being a multi-layer sheet comprising:
• a core layer composed of a polyethylene-based resin as a base resin, and
• skin layers, which are laminated directly on both sides of the core layer and disposed on both outermost surfaces of the core layer and are composed of a polyethylene-based resin as a base resin,
• wherein:
• the multi-layer sheet has a total thickness of 250 μm or more and 600 μm or less,
• the core layer has a thickness of 200 μm or more and 400 μm or less and has a density that is in a range of from 0.880 g/cm3 to 0.930 g/cm3 and a melting point of 70° C. or higher;
• the skin layers have a thickness of 30 μm or more and 100 μm or less and have a density that is in a range of from 0.880 g/cm3 to 0.910 g/cm3 and a melting point of 90° C. or lower;
• the core layer and the skin layers contain a silane-modified polyethylene-based resin, a weight average molecular weight of the silane-modified polyethylene-based resin present in the core layer and the skin layers in terms of polystyrene is 70000 or more;
• a polymerized silane amount of the core layer with respect to a total amount of all resin components is in a range of from 30 ppm to 2000 ppm;
• a polymerized silane amount of the skin layers with respect to a total amount of all resin components is in a range of from 300 ppm to 2000 ppm;
• a melt mass flow rate of the sealing material sheet is 3.0 g/10 min or more and less than 3.8 g/10 min in terms of average of the whole layer;
• a tensile shear adhesion strength measured by a tensile shear adhesion strength measurement experiment is at least 1000 N;
• and
• the tensile shear adhesion strength measurement experiment measures the tensile shear adhesion strength by a test method according to JIS K7197 at a tensile rate of 1.27 mm/min, after preparing an evaluation sample using two colorless strengthened glass plates having a flat surface, placing a sealing material sheet cut to 2.5 cm×1.27 cm between the two glass plates, and performing a vacuum heating lamination treatment at a set temperature of 150° C. under a vacuum aspiration for 3 minutes and an atmospheric pressurization of 7 minutes.